Paper-pulp strainer.



No. 663,529 I Patented Doe. II, I900. J. WILSON.

PAPER PULP STRAINEB.

(Application filed my 28, 1900.)

(No Model.)

we mums Pzrzas co. FHOTO-LWHQ, \VASMINGTQN, u. c.-

- Parar Erica.

JAMES WILSON, OF LONDON, ENGLAND.

PAPER-PU LP STRAINER.

SPECIFICATION forming part of Letters Patent No. 663,529, dated December 1 1, 900- Application filed May 23, 1900. Serial No. 17,750. (No model.)

To all whom it may concern.

Be it known that I, JAMES WILSON, engineer, a subject of the Queen of Great Britain, residing at 81 The Grove, St. Anns Hill, Wandsworth, London, in the county of Surrey, England, have invented a certain new and useful Paper-Pulp Strainer, of which the following is a specification.

According to this invention two strainingplates are employed, either horizontal or inclining downward toward a channel situated between them. Pulp is supplied to the upper side of one or other of the plates from an inlet common to both. There are two valves on the inlet which direct the flow, respectively, to the two plates, being operated by a rocking shaft in such manner that when one is open the otheris closed. Two sluices are provided, one along the lower side of each of the plates, and these sluices are also worked by a rocking shaft in such manner that the sluice at the bottom of each plate is raised immediately the pulp is supplied to it and is then again lowered.

The action is as follows: When the supply is cut off from one of the plates, the liquid drains through it, leaving the dirt, long pieces of fiber, &c., which cannot pass through comparatively dry, and when the supply is turned on again these are washed off the plates by the rush of liquid into the central trough.

Figure 1 is a side elevation, partly in section, of the apparatus; and Fig. 2 is a plan. In these figures the right hand portion is broken away, but it is in all respects similar to the left-hand portion.

- arepresents strainer-plates of ordinary construction.

Y) represents channels supplying pulp to tanks 0.

d represents sluices at the upper ends of the plates 0, and e represents sluices at their lower ends.

f is a channel between the plates a.

g is a toothed wheel, (omitted from Fig. 1,) which is driven in any convenient manner and has fixed to it two cams h and it represents rollers carried by rods and working in the cam h. The rods 70 are pivoted to the arms I on the rocking shafts Z, to which are also fixed arms Z from which the sluices (Z are suspended.

m represents rollers carried by the rods m, which are forked at one end and work on a fixed stud a and whose other ends are pivoted to arms 0 on rocking shafts 0, to which are also fixed arms 0 from which the sluices e are suspended.

When the parts are in the position shown, both sluices e and the left-hand sluice cl are down, while the right-hand sluice d is up. Pulp is therefore being supplied to the righthand plate ct,-but not to the left-hand plate, the pulp flowing toward it being retained in the tank 0 by the sluice d. As the cams revolve in the direction of the arrow, Fig. 1, the left-hand sluice e will first open, and almost immediately afterward the left-hand sluice (1 will open and remain open, liberating the pulp which has collected in theleft-hand tank 0, which, rushing along the left-hand plate a, sweeps the dirt on it into the channel f. The left-hand sluice c then closes and remains closed. After a little less than half a revo lution the right-hand sluice cl closes and pulp collects in the right-hand tank 0, the righthand sluice c opens, the right-hand sluice d opens and remains open, and the right-hand sluice e closes and remains closed, and so on.

Although I have described a pair of plates at, it will be understood that the invention is equally applicable to a single plate or a number of plates. The plates a, may also be inclined instead of horizontal.

What I claim is- 1. The combination of a strainer-plate, means for supplying pulp t0 the plate and a sluice at each end of the plate.

2. The combination of a strainer plate, means for supplying pulp to the plate, a sluice at each end of the plate, the sluice at the inlet end being usually open and the sluice at the other end being usually closed, and means for operating the sluices whereby periodically the sluice at the inlet end is first closed, then the sluice at the other end is opened, the sluice at the inlet end is next opened and lastly the sluice at the other end is closed.

3. The combination of a strainer-plate, a tank, means for continuously supplying pulp to the tank, a sluice between the tank and the plate and a second sluice at the other end of the plate.

4. The combination of a strainer-plate, a

tank, means for continuously supplying pulp second sluice is opened, the first sluice is next to the tank, a sluice between the tank and opened and lastly the second sluice is closed. the plate, a second sluice at the other end of the plate the first sluice being usually open JAMES WILSON and the second sluice being usually closed Witnesses:

and means for operating the sluices whereby WILFRED OARPMAEL,

periodically the first sluice is closed, then the JOSEPH LAKE. 

